fix: Don't add x-is-pointer-node attribute to Capa problem XML on paste [FC-0062]

[bradenmacdonald]

Description

When a problem component is pasted from a library into a course, we use a hack that adds a "temporary" x-is-pointer-node attribute to the XML to prevent XmlMixin from looking for more XML data in a place that doesn't exist (the filesystem). However, this somehow causes the temporary x-is-pointer-node attribute to end up in the capa problem's data (string) attribute, and authors would see that if they use the advanced editor mode.

This PR fixes that by explicitly removing the attribute in cases where it persists.

Supporting information

Relates to openedx/frontend-app-authoring#1377 - this was one of the contributing causes.

Testing instructions

Paste a capa problem component from a library into a course, then open its advanced editor and verify that it doesn't have this attribute in its OLX.

Deadline

Not urgent.

Private ref: FAL-3873

[openedx-webhooks]

Thanks for the pull request, @bradenmacdonald!

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[farhaanbukhsh]

👍

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2U Release Notice: This PR has been deployed to the edX staging environment in preparation for a release to production.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.